View Code of Problem 51

    #include <stdio.h>
    #include <stdlib.h>
         
        /* run this program using the console pauser or add your own getch, system("pause") or input loop */
         
        int main(int argc, char *argv[]) {
        	int n;
        	int i;
        	int j;
        	int a[n][n];
        	int sum=0;
        	scanf("%d",&n);
        	for(i=0;i<n;i++){
        		for(j=0;j<n;j++){
        			scanf("%d",&a[i][j]);
    			}
    			
    		}
    		
    		for(i=0;i<n;i++){
    			for(j=0;j<n;j++){
    				if(i>=j){
    			    sum=sum+a[i][j];
    	       }
    	    }
    	       
    		}
     
    		printf("%d",sum);
        	return 0;
        }

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